Fuel feed valve devices



Aprll 9, 5 P. L. TORRE 2,788,012

FUEL FEED VALVE DEVICES Filed Oct. a1, 1956 Byl- INVENTOR P/Ek 10/01 70225 ATTORNEYS United States Patent 2,788,012 FUEL FEED VALVE DEVICES Pier Luigi Torre, Milan, Italy I Application October 31, 1956, Serial No. 619,436 I Claims priority, application Italy May 2, 1952 2 Claims. (Cl. 137-38) The present invention relates to a fuel feeding valve device for motorcycles, and more particularly to a valve system adapted to prevent return flow of the fuel in an undesirable direction in the conduit connecting the float chamber to the carburetor for auto-vehicle engines, more especially motorcycles. This application is a continuation-impart of my application Serial No. 285,777, filed on May 2, 1952.

- In speed vehicles and particularly in motorcycles, the constant level float chamber of the carburetor is preferably mounted fixed to the frame so that the vibrations of the engine will not have an influence on the tightness of the needle valve of the float chamber. On the other hand, the float chamber must be placed very close to the carburetor body to avoid carburation difliculties due to the irregular flow of fuel.

It is well known that during sudden changes of speed that often occur in auto vehicles on account of braking or rapid accelerations, the fuel in the conduit connecting the feed chamber of the carburetor to the carburetor itself is displaced by inertia in an undesired way, viz. either returning to the float chamber or violently passing to the carburetor, thus provoking irregularities in the Working of the engine.

It is an object of the present invention to provide a valve in the fuel system between the float chamber and the carburetor so as to prevent violent displacements of fuel inside the fuel conduit in either direction.

It is a further object of the invention to provide the valve with a single stem freely mounted for slidable movement in a horizontal position and with a narrow flat disc of light weight resting on either a valve seat or a stop provided in the body of the valve.

With these and other objects and features in view, the invention consists in the construction and arrangement of the parts hereinafter more fully described. The novel features that are considered characteristic of the invention are set forth with particularity in the appended claims. The invention itself, however, both as to its organization and its method of operation, together with additional objects and advantages thereof will best be understood from the following description of a specific embodiment when read in connection with the accompanying drawings, wherein like reference numerals indicate like parts throughout the several figures and in which:

Fig. 1 shows a motorcycle of any conventional type to which is applied the valve that forms the object of the invention, showing the position assumed by it.

Fig. 2 is an enlarged scale axial section of the valve in the normal working position.

Fig. 3 is a section along line 3--3 of Fig. 2, illustrating a detail.

Fig. 4 is a section similar to that of Fig. 2, but illustrating the position that the valve disc assumes when the vehicle is braked, and

Fig. 5 is a vertical transverse section on line 5--5 of 2 Fig. 4 and showing the radial projections on one of the valve seats.

Referring to the drawing in detail, 1 indicates the float chamber containing the fuel, 2 is the carburetor, 3 is the novel valve and 2' is a pipe connecting the valve with the carburetor.

As clearly shown in Figs. 2, 3 and 4, the valve preferably comprises a flat disc element 4 integral with a stem 5 having a three-armed section as clearly illustrated in Fig. 3. Said valve disc 4 is movable in a chamber 6 with the stem 5 slidable in a passage 5' communicating at one side with conduit 7 provided in the body 8 of the valve. The three-armed section of stem 5 forms a guide for the movement of the valve disc 4, said conduit 7 forming a prolongation of the short conduit 9 issuing from float chamber 1. At the other side, internal chamber 6 of the valve communicates with a conduit iii in a fitting 1G for the tube or pipe 2' leading to the carburetor 2. Fitting i0 is provided on its inner end surface 12 with two radial projections 11, 11 forming a seat stop or abutment for the valve disc 4 within and at the left side of the chamber 6. The right side of the chamber 6 is provided with a valve seat 12 for the valve disc 4. In the position of normal working of the fuel system, disc 4 will be pushed by the flux of fuel from the float chamber to assume and maintain the position shown in Fig. 2, namely, to rest on the radial projeetions l1, 11 of the fitting 10. The inside diameter of chamber 6 being appreciably greater than the outside diameter of disc 4, the fuel will freely pass from conduit 9 to conduit 10 skimming the peripheral edge of disc 4 as shown by the arrows in Fig. 2. Projections 11, ill form a stop or an abutment for disc 4 and prevent its engagement with the fiat surface 12 of the fitting it), so that the fuel may pass from chamber 6 into conduit it When brakes are applied to the motorcycle, either for the purpose of stopping the motorcycle or for reducing its speed, valve disc 4, due to inertia, will displace itself from its engagement with projections 11, 11 and will move to engage the valve seat 12 in chamber 6, thus shutting off communication between conduits 9 and t0 and preventing fuel from returning from the carburetor 2 to the float chamber 1. This position of the valve disc 4 is clearly shown in Fig. 4.

When accelerating, the valve disc 4 being in its usual position on the projections 11-41 controls the fuel flux so avoiding that an excessive fuel flux may pass from float chamber 1 to carburetor, which might happen without the above valve disc 4.

The movable valve disc 4 is light and easily displaceable and exerts a very slight friction in the seat of the stem 5 so that no springs or other mechanical means are necessary to move it from one position to the other. The valve disc 4 moves to the stop or abutment formed by projections 11, 11 by the flux of fuel issuing from the float chamber, or to the seat 12' by inertia when brakes are applied to either stop the vehicle or reduce unnecessary acceleration.

It is evident that the valve constitutes a very simple device, is of low cost, is positive in its operation, and prevents serious irregularities in the functioning of the fuel system of the motorcycle.

Although a certain specific embodiment of the invention has been shown and described, it is obvious that many modifications thereof are possible. The invention, therefore, is not to be restricted except insofar as is necessitated by the prior art and by the spirit of the appended claims.

What I claim is:

1. In a fuel feed system for a motorcycle having a carburetor, a fuel float chamber, and a conduit connectin; said chamber with the carburetor and extending longitudinally of the motorcycle, said fuel float chamber being positioned forwardly of the carburetor, saidcondu it having a narrow horizontal portion and an enlarged chamber port-ion provided with an inlet adjacent the float chamber and an outlet adjacent the carburetor, a valve seat on saidtinlet, a valve stop associated with the outlet and comprising radial projections, a valve body including a stern freely mounted for slidable movement in said narrow horizontal conduit portion longitudinally thereof and a narrow, disc, said disc being engngeable with the stop formed by the radial projections by the flux of fuel from the float chamber, and being engageable with the valve seat by the movement of the valve body by inertia; said valve body being of suflicient light weight that it will be moved by the head of reel in the fuel float chamber to engage with the valve stop, whereby said valve body will assume its usual working position without the aid of springs or other mechanical means but solely due to the lightness of the valve body and to the easy displaceability of the said valve body within the conduit by the flux of the fluid.

2. A fuel feed system for a motorcycle comprising a fuel float chamber, a carburetor, a conduit connecting said float chamber and carburetor and extending longitudinally of the motorcycle, said fuel float chamber being positioned forwardly of the carburetor, said conduit having a narrow horizontal portion extending in the direction longitudinally of the motorcycle and an enlarged chamber portion provided with an inlet adjacent the float chamber and an outlet adjacent the carburetor comprising radial projections, 21 valve body including a single stern freely mounted for slidable movement in said narrow horizontal conduit portion and a. narrow disc, said disc being engageable with the stop formed by the radial projections by the flux of fuel from the float chamber in the normal operation of the motorcycle and being engageable with the valve seat upon move ment of the valve body by inertia, said valve body being of suflicient light weight that it will be moved by the head of fuel in the fuel float chamber to engage with the valve stop, whereby said valve body will assume its usual working position without the aid of springs or other mechanical means but solely due to the lightness of the valve body and the easy displaceability of the said valve body within the conduit by the flux of the fluid.

Morse July 20, 1926 Seat Oct. 4, 1938 no Hoa 1 

